Air-compressor system.



itaknown that I," CRL E. L. LIPMAN,

useful Improvements in` Air-Compressor Systems; cation.

1U* teinsforl'generating and 'stormg fluid under `o'jan'ii' -comp'ressorsystemin which air is pressure, fi'oi ivhence it may "heenireqi''fif'red forinflating automobile s. tirespr-r'anyother desiredpurpose. Ii1isystems'fofthis general character itis custi'aryto drivethe air compressor by an eletr'i'jnetor"which is automaticall con-V eosomedayagpressu-reactuatd Svith S f'ftlfijefcompressor is set inOperation When the pressureumthe reservoir 'drops to a predetermlnedminimum, and 1s subsequently '25V-hagbeenf raised-'to a predeterminemaxia, a.: 27.1 l I :i ,I

#It will' beinanifesn however,y that in syste si ofthisfcharacter, ifthecompressor is 0""voir'1`so'thai assoon V'as the compressor is"started;itfni mediately beginsto act against lthe pressure inthe tank,a very heavy load will# imposed`- pen"A the compressor and thdrivingmotor'beire Vthe motor Ahas time *irto'fspeed up; `It l1as' beennecessary, theremuich larger than 1s "`for' e', to install a motor"necssa'ryito operate the'eompressor at high ."fs'pe'edi'n order thatthe motor might be able at() Start the compressor against thefpressu'reAT-inthereservoir without being burned out.

,@wOneof the primar objects of my present ff-1 inventioniisfto provi ein an air vcompressor System means 'which will automatically pere mitthe compressor to start against a milli-v thereby a'.'cit`ize'n""o`tlieUnited States, residing at:

" 5'VVisconsinir have'invented certain new andl of vwhich the 'followingis a) specifi?v Thisinvention relates general to sys-""C'halged'-hetiveen successiveoperatinnspof "p ressureg-l and 'hasy'more' particular reference that. I

cmm n. L. LIPMAN, or nELoIT, "Wisconsin,

nm-conrrnnssoiesYstrIitA serrer' nosas@ l.

, I Specification of Lette-'rs Ratent. 4]pia`t,`]uta;d' Apr. Mu

f` ipliiiation fled January, I l i K insuring vthat-the compressor will''start each timefunder a minimum load.

` A fr'therfobject of fthisjinvention' is to provide means the pressurelinetbeitwgen the compressorand the storage reservoir'in whichnioisture,` oil,ietc.; carried'by the air from' the' comp essor will *beVTcollected and from which'itwill beautomaticlly disvthe compressor,v

Otherbbjfefc'ts many 'ofthe attendant advantages '-of this inventionwill bei readily iS-"the"inventiony is better un- *appreciate referenceto tliejffolloiving, de-

derstood by scription when consideredin connection with 70 ontrolledfThe motor glenei'torwl, pressure ,otrolled ser@ which is conb,lreserlolr 8 so that 11i liefreseiv When a predetermined minimfunri-theclose, thereby'kautomatically, listar iig the compres'soifand,L-Wheh thepressu-rein the reservoir hasbeen raised-,to a predetermined bore andthe compartment through a pluim ralit of ports 19 and 21 respectively. Achec valve 22 is interposed between the comartment 18 and the reservoirto prevent ack-How of pressure from the reservoir into the compartment,and a pressure gage 23 ol. any referred type is mounted upon the cham er16 by means of 'apipe 24, so that the gage will 'registerlthepressure inthe The lower end of the bore 15 below the port 21 is closed by a hollowplug 25 pro-l vided vvith a ta ered valve seat 26 which' 1s..

adapted to be e, oscd by a valve 27 carried by a plunger 28 which isnormally held in the elevated position shown in Fig. 2 by a coiled.expansion spring 29. A plunger 31 is disposed in the bore 15 above theplunger 28 and is normally held in thepositlon shown in Fig. 2 by acoiled spring 32.

When the compressor is idle the pressure .in the reservoirispreventcdfrom backing up in the line by the check valve 22, while the compartment18 isopen to the atmosphere through port 21 and the hollow plug 25.Assuming now that the current is turned on to start the motor thecompressor will begin to operate against a pressure l equal toatmospheric pressure plus the tenabove atmospheric sion of the light`spring 32, thus 'imposing only a small load lon the compressor andmotor.` As the pressure increases in the pipe 9 the plunger 31 will bedepressed below the port 19, thereby permitting the air to enter thecompartment 18. Downward compartment 18 is lling up the motor andcompressor will have time to speed up to the required velocity to Workagainst the pressure in the reservoir 8. When the pressure in thecompartment 18 exceeds that in the storage reservoir the check valve 22will, of course, open against the force ot its lspring and permit thepressure to be dellvered into the reservoir.

When the compressor is stopped the pressure in the pipev9 will diminish,whercupoi'i. spring 32 will return plunger 31 to the position shown inFig. 2, and spring 29 will open the valve 27, permitting the pressure inthe compartment 18 to escape to the atmosphere. The pressure in thecompartment 18 is, therefore, automatically relieved each time thecompressor stops, with the result that the compartment 18 must be filledand the pressure therein must be gradually raised before the compressorand motor will be subjected to their normal working load.

Lac-1,134.1l

This construction obviously gives the mo tor and compressor su'licienttime to develop the plug 25. I prefer to provide a' baille plate inthe-compartment 18 to deiect the Aincoming air and facilitate thedeposit of oil and moisture in the compartment. A nother baflle-plate 34which also serves as a strengthening or reinforcing member is preferablydisposed substantially centrally of the compartment 18. y

While I have used the term air throughout the specification as definingthe fluid to be handled vby the system, it should be understood that myinvention-is not restricted to systems in which air is employed but isequally adapted for'use in systems in which water or other fluids areemployed. Q

It is believed that the construction and operation of my invention willbe understood from the foregoing without further description and itshould be manifest that by the use of this system a considerable savinginthe initial cost of the motor and in the running expense of the motoris eected.

I claim:

1. In a fluid compressor system, the combination of a compressor, astorage reservoir and connections between said compressor andreservoircomprising a chamber connected with the reservoir; a bore'disposed atone side of said chamber and connected at its upper end with'thecompressor and at itsl lower end with the atmosphere, a portestal'ilishing` communication between the lower end of said chamber andsaid bore, a second pori. establishingcommunication between said chamberand bore near the upper end thereof, a valve adapted to shut oil.'communication between the lower end ot said bore and the atmosphere, aspriugfor normally unseating said valve, a plunger disposed in said boreand normally covering said upperA port,f`and `a spring disposed betweensaid valve and said 'plunger adapted lo yield under the-pressure exertedby said compressor to therebyv uncover said upper port and closeseddw'alve.

2. In a, lluid compressor' system, the com-l binatiou olf a compressor,a storagev reser-fl voir and connections between said c0m presser andreservoir comprising a chamber connected with the reservoir, a boredisposed at one sioe 0I said chamber and connected at its upper end withthe conipressor and at its'lower end with the atmosphero, a portestablishing communication between the lower end of said chamber andsaid bore, a second port eslablishing communication between said chamberand bore near the upper end thereof, a valve adapted to shut ofi'communication between the lower end of said bore and the atmos phere, aspring for normally unseacing said4 valve, and means in said borenormally covering said upper port. and connected With said valve forclosing said valve and opening said upper port upon admission ofairunder pressure above said means. A. l

CARL E. L. LIPMAN. A litnessesr IRA J. WILSON, A. G. LATIMER.

